At 9:25 AM, Operations reported that a Main Injector (MI) crate had lost power for about an hour. It had backup power, but only for twenty minutes. Operations put shot setup on hold for twenty-five minutes while experts confirmed that the crate was okay.

At 10:39 AM, a BoosterRF station (BRF16) tripped off for the first of two times in six minutes.

Linac experts turned off LRF5 at 9:26 AM to replace the power amplifier tube. This halted all downstream beam.

At 10:24 AM, a Booster quadrupole power supply (B:Q802) tripped off for the first of three times in twenty minutes. It reset okay each time.

At 10:51 Booster experts said that the 400 MeV area chopper (B:CHOP) had to have its "on" tube changed out. They began repairs.

Linac expert reported at 12:32 PM that they had completed their work on LRF5.

Booster experts reported at 1:34 PM that the chopper was fixed, but operators reported having trouble sending beam to Booster. Operations reported at 2:20 PM that the beam was going to the Linac dump rather than down the 400 MeV line. Experts continued to investigate.

Operations reported that beam through Linac and Booster had resumed by 2:53 PM. Pbar resumed stacking and MiniBooNE and MCenter resumed taking beam.

At 3:04 PM, LRF2 tripped off.

At 3:05 PM, Operations reported that the new chopper on tube was putting out noise and causing the "off" tube to fire. Experts investigated.

Pbar resumed stacking at 3:19 PM.

Operations reported at 4:09 PM that Booster experts added a new filter to the chopper.

At 5:15 PM, BRF16 tripped off. It reset okay.

At 5:31 PM, Operations reported that a Linac quadrupole power supply (L:QPS107) wouldn't regulate properly. Operators swapped control cards and had in back up by 5:54 PM.

At 7 PM, BRF3 tripped off. It reset okay.

Operations terminated store 4075 at 7:05 PM.

Operations put the TeV into shot setup at 7:25 PM.

At 8:32 PM, BRF16 tripped off. It reset okay.

At 9:02 PM, Operations reported that during the first transfer of antiprotons from Pbar, the TeV quenched at sector E4. The first transfer was supposed to hold 32mA, but it had held 41.4mA instead.

Wednesday April 6
The midnight shift began with the TeV in shot setup, with Operations monitoring the stack and stash, and with MiniBooNE taking beam.

At 12:52 AM, a Booster power supply (DOG13) tripped due to a magnet water-flow switch. Operations contacted an expert who suggested that operators access the tunnel and convince the switch that it should resume working.

At 12:55 AM, Operations reported that an Accumulatorsepta (A:ISEP2V) had tripped off and wouldn't reset. Operations called in an expert who had the septa fixed by 1:52 AM.

Operators reported at 2:32 AM that they had accessed Booster, rapped on the flow switch for DOG13, and got it to reset.

Operations resumed shot setup at 2:44 AM.

At 3:02 AM, Operations reported that they'd been having trouble with the Accumulator kickers since the TeV quench. Operations contacted a Pbar expert for help who explained how to get Pbar back into its extraction mode.